Shown below are points of interest regarding navigation, navigation safety, or other Navigation Center missions. The links will stay on this page for approximately ninety days and then will be removed. The documents they linked to will be archived. You may search our site, including the archives, by keyword, to find the document, publication, or other note of interest for which you may be looking.

• **HIGH HDOP ADVISORY** Users in certain parts of the world may experience short periods of high HDOP/PDOP on September 11th, 2009. Read more...
• The GPS 256 week rollover may be causing problems for some GPS receivers. For more information, please read this advisory...
• The CGSIC States and Localities subcommittee met in Honolulu 23-24 June 2009. Find more details in our CGSIC Meetings section...
• Cape Canaveral, Fla., (March 24, 2009) - A United Launch Alliance Delta II rocket successfully launched the Air Force's Global Positioning Satellite GPS IIR-20(M) into orbit from Space Launch Complex 17A at 4:34 a.m. EDT. Read more…
• The USCG invites the public to attend a meeting on March 25th, 2009 at the Federal Building, Seattle WA-to comment on its NOAD-AIS proposed rulemaking. Read more...
• NOAA's National Ocean Service (NOS) intends to eliminate LORAN-C lattices from future editions of NOS Paper Nautical Charts and Raster Navigational Charts starting in 2009. NOAA's Office of Coast Survey (OCS) requests that all comments about this change be sent via OCS's inquiry page before April 24, 2009. Any other questions may be directed to the inquiry page or by calling NOAA's navigation inquiry hotline: 1-888-990-NOAA (6622).
• LRIT Implementation/Conformance Testing - Operators of U.S. flagged vessels subject to the LRIT Regulation are encouraged to contact the USCG to discuss LRIT implementation and conformance test scheduling. Read more...
• The USCG seeks comment on its proposed rulemaking that significantly changes existing AIS regulations (33 CFR 164.46) and expands carriage to most commercial vessels operating on U.S. navigable waters.
• The International Earth Rotation and Reference Systems Service has announced the introduction of a leap second to occur at the end of Dec 2008. Read the entire NANU...
• Users of semi-codeless/codeless receiving equipment are expected to transition to using GPS civil-coded signals by Dec. 31, 2020. Read the announcement...
• U.S. Reaffirms Commitment to GPS in letter to International Maritime Organization. Read more...
• USCG seeks comment on its proposed rulemaking to expand AIS carriage to most commercial vessels operating on U.S. navigable waters. Deadline: April, 2009.
• Transportation Worker Identification Requirements (TWIC): By April 15, 2009, all USCG credentialed mariners will be required to hold a TWIC in certain situations. Read more...
• The U.S. Dept of Transportation approved a decision to continue the inland component of the National DGPS. Read more...
• CG High Freq Radiotelex (SITOR) AMVER and OBS service discontinued from all locations except Guam on 30 Sept 2008. Read more...
• For a limited period beginning June 15, 2008, NOAA RNCs will not be updated for Notices to Mariners or for new editions of the nautical charts. Read more...
• DoD Announcement: Success In Intercepting Non-Functioning Satellite in final orbits. Read more...
• The GPS Community gained approval to set SVN23 (PRN32) usable, mostly likely on 19 FEB 2008. Read
  the full text of the General Advisory 2008016 (scroll down to the bottom of the linked page). Also please read the U.S. Air Forces Memorandum for GPS Users and User Equipment Manufacterers.
• Adoption of a National Backup System to GPS.
• Reported GPS/AIS User Equipment Problems Involving PRN32. Read our notice...
• Please see our page regarding the ceasing of HF Radio Weather Broadcasts. The U.S. Air Force has released a media announcement concerning the transition from the legacy GPS Master Control Station (MSC) to a new GPS ground segment control system called "Architecture Evolution Plan" (AEP). You may read it here.
• The U.S. DOT approved a decision to continue the inland component of the NDGPS, which provides an accurate, highly-reliable, real-time GPS correction signal. The decision is based on the results of the NDGPS user assessment conducted by the Research and Innovative Technology Administration (RITA). Read the DOT press release....
• A decision has made to continue providing high frequency (HF) radio broadcasts of weather forecasts and warnings...Final Report now available: A Business Case for the Continuance of the USCG High-freq Broadcasts of National Weather Service Marine Weather Forecasts.
• September 7, 2007; Please read Coast Guard Marine Safety Alert 2-07 (PDF, 85K) regarding marine radios and AIS equipement.
• The Department of Transportation (Research and Innovative Technology Administration) and the U.S. Coast Guard request your comments regarding need to continue to operate the inland component of the Nationwide Differential Global Positioning System (NDGPS) Program. Please read our introductory page and the notice and submit your comments to the Docket Management Website. Use docket number 28836.
• The Coast Guard requests public participation regarding its intent to prepare an Environmental Impact Statement on the Future of LORAN. Please read the notice and submit your comments to the Docket Management Website. Please do not submit comments via this website, but instead, use the Docket Management Website, the official comment submission platform. Use docket number 28460. Comments must be submitted by August 31st, 2007.
• The Coast Guard is soliciting public comment on the need to continue providing high frequency (HF) radio broadcasts of weather forecasts and warnings. Please read the notice and submit your comments to the Docket Management Website. Please do not submit comments via this website, but instead, use the Docket Management Website, the official comment submission platform.Comments must be submitted by August 24th, 2007. Use docket number 27656.